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Steps to reproduce : 1. Create 2 signals 2. Create an association between them. You obtain this exception : java.lang.ClassCastException: org.eclipse.gmf.runtime.notation.impl.ShapeImpl cannot be cast to org.eclipse.uml2.uml.Classifier at org.eclipse.papyrus.diagram.clazz.custom.helper.AssociationEndSourceLabelHelper.getUMLElement(AssociationEndSourceLabelHelper.java:45) at org.eclipse.papyrus.diagram.clazz.custom.edit.part.AssociationEndTargetEditPart.resolveSemanticElement(AssociationEndTargetEditPart.java:48) at org.eclipse.papyrus.diagram.clazz.edit.parts.AssociationName5EditPart.getParserElement(AssociationName5EditPart.java:369) at org.eclipse.papyrus.diagram.clazz.edit.parts.AssociationName5EditPart.getLabelText(AssociationName5EditPart.java:315) at org.eclipse.papyrus.diagram.clazz.edit.parts.AssociationName5EditPart.refreshLabel(AssociationName5EditPart.java:586) at org.eclipse.papyrus.diagram.clazz.edit.parts.AssociationName5EditPart.refreshVisuals(AssociationName5EditPart.java:624) at org.eclipse.papyrus.diagram.clazz.edit.parts.AssociationName5EditPart.setLabel(AssociationName5EditPart.java:659) at org.eclipse.papyrus.diagram.clazz.edit.parts.AssociationEditPart.addFixedChild(AssociationEditPart.java:74) at org.eclipse.papyrus.diagram.clazz.edit.parts.AssociationEditPart.addChildVisual(AssociationEditPart.java:51) at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:210) at org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart.addChild(ConnectionEditPart.java:213) at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:771) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:718) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:633) at org.eclipse.gef.editparts.AbstractConnectionEditPart.refresh(AbstractConnectionEditPart.java:226) at org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart.access$1(ConnectionEditPart.java:1) at org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart$5.run(ConnectionEditPart.java:1127) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328) at org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart.refresh(ConnectionEditPart.java:1124) at org.eclipse.gef.editparts.AbstractConnectionEditPart.setTarget(AbstractConnectionEditPart.java:304) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addTargetConnection(AbstractGraphicalEditPart.java:291) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refreshTargetConnections(AbstractGraphicalEditPart.java:740) at org.eclipse.gmf.runtime.diagram.ui.editparts.ShapeNodeEditPart.handleNotificationEvent(ShapeNodeEditPart.java:229) at org.eclipse.papyrus.diagram.common.editparts.NodeEditPart.handleNotificationEvent(NodeEditPart.java:66) at org.eclipse.papyrus.diagram.common.editparts.UMLNodeEditPart.handleNotificationEvent(UMLNodeEditPart.java:94) at org.eclipse.papyrus.diagram.common.editparts.NamedElementEditPart.handleNotificationEvent(NamedElementEditPart.java:47) at org.eclipse.papyrus.diagram.common.editparts.ClassifierEditPart.handleNotificationEvent(ClassifierEditPart.java:50) at org.eclipse.papyrus.diagram.clazz.edit.parts.SignalEditPart.handleNotificationEvent(SignalEditPart.java:138) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.notifyChanged(GraphicalEditPart.java:1438) at org.eclipse.gmf.runtime.diagram.core.listener.DiagramEventBroker.fireNotification(DiagramEventBroker.java:500) at org.eclipse.gmf.runtime.diagram.core.listener.DiagramEventBroker.resourceSetChanged(DiagramEventBroker.java:395) at org.eclipse.gmf.runtime.diagram.ui.DiagramEventBrokerThreadSafe.resourceSetChanged(DiagramEventBrokerThreadSafe.java:73) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl$1.run(TransactionalEditingDomainImpl.java:781) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.postcommit(TransactionalEditingDomainImpl.java:771) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.deactivate(TransactionalEditingDomainImpl.java:543) at org.eclipse.emf.transaction.impl.TransactionImpl.close(TransactionImpl.java:712) at org.eclipse.emf.transaction.impl.TransactionImpl.commit(TransactionImpl.java:474) at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:155) at org.eclipse.gmf.runtime.common.core.command.CompositeCommand.doExecuteWithResult(CompositeCommand.java:403) at org.eclipse.gmf.runtime.common.core.command.AbstractCommand.execute(AbstractCommand.java:135) at org.eclipse.gmf.runtime.common.core.command.CompositeCommand.doExecuteWithResult(CompositeCommand.java:403) at org.eclipse.gmf.runtime.common.core.command.AbstractCommand.execute(AbstractCommand.java:135) at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:511) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:206) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:169) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:156) at org.eclipse.gef.tools.AbstractTool.executeCommand(AbstractTool.java:426) at org.eclipse.gef.tools.AbstractTool.executeCurrentCommand(AbstractTool.java:443) at org.eclipse.papyrus.diagram.common.service.AspectUnspecifiedTypeConnectionTool.handleCreateConnection(AspectUnspecifiedTypeConnectionTool.java:117) at org.eclipse.gmf.runtime.diagram.ui.tools.ConnectionCreationTool.handleButtonUp(ConnectionCreationTool.java:181) at org.eclipse.gef.tools.AbstractTool.mouseUp(AbstractTool.java:1206) at org.eclipse.gef.EditDomain.mouseUp(EditDomain.java:301) at org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouseReleased(DomainEventDispatcher.java:380) at org.eclipse.draw2d.LightweightSystem$EventHandler.mouseUp(LightweightSystem.java:538) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:213) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1052) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657) at org.eclipse.jface.window.Window.runEventLoop(Window.java:825) at org.eclipse.jface.window.Window.open(Window.java:801) at org.eclipse.ui.internal.views.log.EventDetailsDialog.open(EventDetailsDialog.java:176) at org.eclipse.ui.internal.views.log.EventDetailsDialogAction.run(EventDetailsDialogAction.java:98) at org.eclipse.ui.internal.views.log.LogView$15.doubleClick(LogView.java:536) at org.eclipse.jface.viewers.StructuredViewer$1.run(StructuredViewer.java:824) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.StructuredViewer.fireDoubleClick(StructuredViewer.java:822) at org.eclipse.jface.viewers.AbstractTreeViewer.handleDoubleSelect(AbstractTreeViewer.java:1403) at org.eclipse.jface.viewers.StructuredViewer$4.widgetDefaultSelected(StructuredViewer.java:1225) at org.eclipse.jface.util.OpenStrategy.fireDefaultSelectionEvent(OpenStrategy.java:238) at org.eclipse.jface.util.OpenStrategy.access$0(OpenStrategy.java:235) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:296) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1052) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2601) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2565) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2399) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:669) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:662) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574) at org.eclipse.equinox.launcher.Main.run(Main.java:1407) at org.eclipse.equinox.launcher.Main.main(Main.java:1383)
Now it is possible to create an asociation between two signals
